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Finding the Fourth Proportional to 18.31, 25.24 and 11.39

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Solution

The fourth proportional to 18.31, 25.24 and 11.39 is: 15.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.31 : 25.24 = 11.39 : x
  2. Step 2: Convert to fraction form
    18.31/25.24 = 11.39/x
  3. Step 3: Cross multiply
    18.31x = 25.24 × 11.39
  4. Step 4: Simplify right side
    18.31x = 287.47
  5. Step 5: Solve for x
    x = 287.47/18.31
  6. Step 6: Final answer
    x = 15.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.